From: William F. Hammond <hammond@csc.albany.edu>

Date: Wed, 12 Apr 2000 18:04:58 -0400 (EDT)

Message-Id: <200004122204.SAA06544@hilbert.math.albany.edu>

To: jsdevitt@radicalflow.com

Cc: www-math@w3.org

Date: Wed, 12 Apr 2000 18:04:58 -0400 (EDT)

Message-Id: <200004122204.SAA06544@hilbert.math.albany.edu>

To: jsdevitt@radicalflow.com

Cc: www-math@w3.org

> The capability seems to be present. Yes. I was writing about using TeX-like author markup as close as possible to tradition to create content-sound SGML suitable for translation to MathML. I had suggested that given (with simplified typing) > > \declaremathsymbol{D}{operator} > > \declaremathsymbol{y}{function} the expression D^2 y would be adequate author markup. You wrote: > D^2 ( y ) could equally well mean D(y) * D(y) While both of these two expressions are consistent with the types, the second is more naturally indicated with (D y)^2, which requires parentheses in order to distinguish it from D (y^2), while parentheses in the expression D^2 (y) do not serve to distinguish it from D^2 y . If a parser were to infer D(y)*D(y) from D^2 y , then wouldn't it be via an earlier inference of (D y)^2 from D^2 y ? But doesn't convention dictate that exponents bind more tightly than juxtapositions? Aside from that one reaches (D y)^2 only after reversing the order of '2' and 'y' in the parse. (The interpretation D^(2y) is eliminated out by the TeX rule that a superscript of more than two markup characters must be braced and also, without more context, precluded by the types.) -- BillReceived on Wednesday, 12 April 2000 18:05:31 GMT

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